Re-enable allmost all base tests.

BUG=3836
R=marpan@google.com

Review URL: https://webrtc-codereview.appspot.com/22989004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7416 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/nat_unittest.cc b/webrtc/base/nat_unittest.cc
index 19c1225..1d4ee41 100644
--- a/webrtc/base/nat_unittest.cc
+++ b/webrtc/base/nat_unittest.cc
@@ -237,11 +237,11 @@
   TestFilters(int_pss.get(), int_addr, ext_pss.get(), ext_addrs);
 }
 
-TEST(NatTest, DISABLED_ON_MAC(TestPhysicalIPv4)) {
+TEST(NatTest, TestPhysicalIPv4) {
   TestPhysicalInternal(SocketAddress("127.0.0.1", 0));
 }
 
-TEST(NatTest, DISABLED_ON_MAC(TestPhysicalIPv6)) {
+TEST(NatTest, TestPhysicalIPv6) {
   if (HasIPv6Enabled()) {
     TestPhysicalInternal(SocketAddress("::1", 0));
   } else {
@@ -279,11 +279,11 @@
   TestFilters(int_vss.get(), int_addr, ext_vss.get(), ext_addrs);
 }
 
-TEST(NatTest, DISABLED_ON_MAC(TestVirtualIPv4)) {
+TEST(NatTest, TestVirtualIPv4) {
   TestVirtualInternal(AF_INET);
 }
 
-TEST(NatTest, DISABLED_ON_MAC(TestVirtualIPv6)) {
+TEST(NatTest, TestVirtualIPv6) {
   if (HasIPv6Enabled()) {
     TestVirtualInternal(AF_INET6);
   } else {